Chemistry Class 10th MCQs

Chemistry Class 10th MCQs with answers for matriculation paper preparation online.

Chemistry Class 10th MCQs

For which system does the equilibrium constant, Kc has units of concentration:

1. N2(g) + 3H2(g) ⇌ 2NH3(g)
2. N2(g) + 02(g) ⇌ 2NO
3. H2(g) +12(g) ⇌ 2HI(g)
4. CO2(g) + H3(g) ⇌ CO + H2O(l)

The unit of Kc for reaction N2 + O2 ⇌ 2NO:

1. mol dm^-3
2. mol^-2 dm^6
3. mol^-1dm3
4. No unit

The system is stable in equilibrium when:

1. Qc = Kc
2. Qc > Kc
3. Qc < K
4. None of these

Qc can be defined as:

1. Ratio of product and reactants
2. Ratio of molar concentration of product
3. Ratio of molar concentration of product and reactant raised to the power of coefficient

The value of Kc increases when:

1. [Product] is less
2. [Product] is more
3. [Reactant] is more
4. [Reactant = product]

Corrosive effect on skin is caused by:

1. Acid
2. Base
3. Salt
4. Both a & b

Preservatives are used to preserve:

1. Acids
2. Bases
3. Food
4. Water

Which of the following is not an Arrhenius acid:

1. HCl
2. CO2
3. HNO3
4. H2SO4

NH3 can be a base according to:

1. Arrhenius theory
2. Bronsted-Lowery theory
3. Lewis theory
4. Both b and c

Which of the following is a Lewis base:

1. HNO3
2. CN
3. HCl
4. AlCl3